1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/*
Mosh: the mobile shell
Copyright 2012 Keith Winstein
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations including
the two.
You must obey the GNU General Public License in all respects for all
of the code used other than OpenSSL. If you modify file(s) with this
exception, you may extend this exception to your version of the
file(s), but you are not obligated to do so. If you do not wish to do
so, delete this exception statement from your version. If you delete
this exception statement from all source files in the program, then
also delete it here.
*/
#include <cassert>
#include <cerrno>
#include <cstdint>
#include <cwchar>
#include <typeinfo>
#include "src/terminal/parser.h"
const Parser::StateFamily Parser::family;
static void append_or_delete( Parser::ActionPointer act,
Parser::Actions &vec )
{
assert( act );
if ( !act->ignore() ) {
vec.push_back( act );
}
}
void Parser::Parser::input( wchar_t ch, Actions &ret )
{
Transition tx = state->input( ch );
if ( tx.next_state != NULL ) {
append_or_delete( state->exit(), ret );
}
append_or_delete( tx.action, ret );
if ( tx.next_state != NULL ) {
append_or_delete( tx.next_state->enter(), ret );
state = tx.next_state;
}
}
Parser::UTF8Parser::UTF8Parser()
: parser(), buf_len( 0 )
{
assert( BUF_SIZE >= (size_t)MB_CUR_MAX );
buf[0] = '\0';
}
void Parser::UTF8Parser::input( char c, Actions &ret )
{
assert( buf_len < BUF_SIZE );
/* 1-byte UTF-8 character, aka ASCII? Cheat. */
if ( buf_len == 0 && static_cast<unsigned char>(c) <= 0x7f ) {
parser.input( static_cast<wchar_t>(c), ret );
return;
}
buf[ buf_len++ ] = c;
/* This function will only work in a UTF-8 locale. */
wchar_t pwc;
mbstate_t ps = mbstate_t();
size_t total_bytes_parsed = 0;
size_t orig_buf_len = buf_len;
/* this routine is somewhat complicated in order to comply with
Unicode 6.0, section 3.9, "Best Practices for using U+FFFD" */
while ( total_bytes_parsed != orig_buf_len ) {
assert( total_bytes_parsed < orig_buf_len );
assert( buf_len > 0 );
size_t bytes_parsed = mbrtowc( &pwc, buf, buf_len, &ps );
/* this returns 0 when n = 0! */
if ( bytes_parsed == 0 ) {
/* character was NUL, accept and clear buffer */
assert( buf_len == 1 );
buf_len = 0;
pwc = L'\0';
bytes_parsed = 1;
} else if ( bytes_parsed == (size_t) -1 ) {
/* invalid sequence, use replacement character and try again with last char */
assert( errno == EILSEQ );
if ( buf_len > 1 ) {
buf[ 0 ] = buf[ buf_len - 1 ];
bytes_parsed = buf_len - 1;
buf_len = 1;
} else {
buf_len = 0;
bytes_parsed = 1;
}
pwc = (wchar_t) 0xFFFD;
} else if ( bytes_parsed == (size_t) -2 ) {
/* can't parse incomplete multibyte character */
total_bytes_parsed += buf_len;
continue;
} else {
/* parsed into pwc, accept */
assert( bytes_parsed <= buf_len );
memmove( buf, buf + bytes_parsed, buf_len - bytes_parsed );
buf_len = buf_len - bytes_parsed;
}
/* Cast to unsigned for checks, because some
platforms (e.g. ARM) use uint32_t as wchar_t,
causing compiler warning on "pwc > 0" check. */
const uint32_t pwcheck = pwc;
if ( pwcheck > 0x10FFFF ) { /* outside Unicode range */
pwc = (wchar_t) 0xFFFD;
}
if ( (pwcheck >= 0xD800) && (pwcheck <= 0xDFFF) ) { /* surrogate code point */
/*
OS X unfortunately allows these sequences without EILSEQ, but
they are ill-formed UTF-8 and we shouldn't repeat them to the
user's terminal.
*/
pwc = (wchar_t) 0xFFFD;
}
parser.input( pwc, ret );
total_bytes_parsed += bytes_parsed;
}
}
Parser::Parser::Parser( const Parser &other )
: state( other.state )
{}
Parser::Parser & Parser::Parser::operator=( const Parser &other )
{
state = other.state;
return *this;
}
|
